Cleaned it off and looked again. Definitely coming from the shaft that spins the impeller. Is there a reparable seal on that shaft?

The little screw secures the cam inside the pump cavity.

If a Yanmar engine, it will probably have a Johnson pump installed. The seals can typically be changed and are available individually, or in a pump rebuild kit. You may need a gear and bearing puller to disassemble it, and possibly a press to reassemble, depending on the model.

Believe it or not, the shaft seals on the raw water side have been known to leak when the pump runs after a period of disuse, and re-seal after running for a while. I have seen this on two different Yanmar diesels. Since you have it back together, run it a while and see what happens. If it fails, it will likely fail slowly so it can't hurt to run it a bit and see.

If a Yanmar engine, it will probably have a Johnson pump installed. The seals can typically be changed and are available individually, or in a pump rebuild kit. You may need a gear and bearing puller to disassemble it, and possibly a press to reassemble, depending on the model.

Believe it or not, the shaft seals on the raw water side have been known to leak when the pump runs after a period of disuse, and re-seal after running for a while. I have seen this on two different Yanmar diesels. Since you have it back together, run it a while and see what happens. If it fails, it will likely fail slowly so it can't hurt to run it a bit and see.

Actually, here is a pretty good overview of what it will take to overhaul the Johnson pump. Compass Marine did a good job on this and it clearly shows what it will take.

Sources for the pump parts are the generator manufacturer, Yanmar if you can positively identify the engine type, Depco Pump Company, or just get online with the pump model number and see what sources you can find.

Actually, here is a pretty good overview of what it will take to overhaul the Johnson pump. Compass Marine did a good job on this and it clearly shows what it will take.

Sources for the pump parts are the generator manufacturer, Yanmar if you can positively identify the engine type, Depco Pump Company, or just get online with the pump model number and see what sources you can find.

There is no upside to waiting for the pump to fail, which it will. Weep holes are there for a reason, to weep before you do. As suggested by some very bright people already on this thread, get a new pump. Then you can play around with hammering on your old one.

As you continue bringing your vessel back into reliable shape do each task correctly and conservatively. You will not regret it

I cant say enough for Depco pump. They will fix your pump and get it back to you quick and reasonable. They will give you a cost estimate on the phone before you send it to them. Best service I have ever had.
Agree that you should buy a new pump and rebuild or get this one rebuilt. Having a backup on trips is worth alot.

Now to figure out what pump I have. It looks like a Johnson pump from some pics I've matched up on the internet. I didn't see any numbers on my pump, but it was still installed on the genny and hard to see.

"If it fails, it will likely fail slowly so it can't hurt to run it a bit and see."

The pump pressurizes the water to move it.

The area behind the pump that drives it is not under pressure.

Why would the seal failure not pump water into the engine block?

Is there a second oil seal in the block?

Fred,

Yes, there are two seals, one on the water side and the other on the crankcase side. The weep hole is between them so that if either leaks, it is directed out of the pump housing and does not cross from one side to the other. It also provides a visual indication of which seal is leaking.
All in all a pretty good design.

Sent the pic to Pumpvendors so they could try to match it up, and the guy emailed me back in 5 minutes. Said he got the number off the front plate that I emailed him. I totally missed the part number stamped on the plate. I'm blind.

Sent the pic to Pumpvendors so they could try to match it up, and the guy emailed me back in 5 minutes. Said he got the number off the front plate that I emailed him. I totally missed the part number stamped on the plate. I'm blind.

If this is the pump, it looks like they also sell the Major and Minor Service Kits at reasonable prices. You might ask them if you haven't already. That way, you could rebuild your old one for a spare for not too many $$$.

If a Yanmar engine, it will probably have a Johnson pump installed. The seals can typically be changed and are available individually, or in a pump rebuild kit. You may need a gear and bearing puller to disassemble it, and possibly a press to reassemble, depending on the model.

Quote:

Originally Posted by cardude01

Found the pump finally. It is a Jabsco pump. $350. Sigh.

Sent the pic to Pumpvendors so they could try to match it up, and the guy emailed me back in 5 minutes. Said he got the number off the front plate that I emailed him. I totally missed the part number stamped on the plate. I'm blind.

I was just about to say our Kohler genset has a Yanmar 3TNE diesel and the pump is a Sherwood. With code stamped on the plate. And it uses SAE fasteners. (Which I didn't expect, until I figured out the pump was a Sherwood.)